Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 While these switches can fail

While these switches can fail due to age or vibration

we recommend maintaining the original pipe diameter to ensure the BTU rating of the heater is not compromised by gas starvation

When you're servicing high-efficiency units like the Lochinvar Knight XL or A

always verify the rotation of your existing blower wheel before mounting to ensure correct airflow direction

Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 While these switches can failThe Lochinvar & A. O. Smith 100166080 Thermal Switch is a critical safety component designed for Residential FVIR (Flammable Vapor Ignition Resistant) gas water heaters. As a resettable thermal switch, it monitors the combustion chamber for excessive temperatures or restricted airflowcommon issues in systems with a clogged flame arrestor or inadequate makeup air. This rollout switch acts as a manual reset high limit, preventing gas flow to the burner